Ticket #7678 (closed Bugs: fixed)
multiple definitions of bool boost::polygon::belongs(...) by multiple #include
|Reported by:||Manfred <kuhnkies@…>||Owned by:||asydorchuk|
I encountered a linker problem within the voronoi code of library boost::polygon when using MSVS 2008. There (and I guess on many other compilers) will be multiple definitions of function
as soon as there is direct or transitive
in more than one compile unit (.cpp file). This linker problem will not occur if only one .cpp file #includes this file (see single tutorial file libs/polygon/example/voronoi_visualizer.cpp and e.g. split this file into class related .h/.cpp files).
Seemingly compiling each compile unit like foo.cpp, bar.cpp, etc. produces a definition of
into its individual .obj-file, namely foo.obj, bar.obj, etc.. Later the linker can not resolve which of the multiple definitions of "belongs", the one in foo.obj or the one in bar.obj, to take when binding the executable.
I could fix that problem in my local boost code by making "belongs" an inline function.
file : boost/polygon/voronoi_geometry_type.hpp line 36 : bool belongs( // taken from svn-trunk altered : inline bool belongs( // my local modification
Inlining won't create any definition of "belongs" in .obj file(s) at all, hence no multiple definitions. There may be other, better solutions that I don't know of, of course.
- Owner changed from ljsimons to asydorchuk
- Status changed from new to assigned